Locomotive-brake.



H. A. WAHLEBT.

LUCOMOTIVE BRAKE.

\Applxca.txon filed Aug 3 1901 l WITNESSES:

(No Model.)

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HENRY A. IVAHLERT, OF ST. LOUIS, MISSOURI, ASSIGNOR TO TIIE AMERICANBRAKE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

LOCOWITIVEMBRAKE.

SPECIFICATION forming part of Letters Patent No. 696,525, dated April 1,1902. Application led August 3, 1901. Serial No. 70,757. (No model.)

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Be it known that I, HENRY A. WAHLERT, a citizenof the United States,residing in the city of St. Louis, State of Missouri, have invented ordiscovered a certain new and useful Improvementin Locomotive-Brakes, ofwhich improvement the following is a specification.

My invention relates to brakes for locomotives, and has for its objectto provide an arrangement by which the slack due to the wear of thedriver brake-shoes will be automatically taken up.

My invention consists in a certain combination and arrangement of parts,all as hereinafter more fully set forth and claimed.

In the accompanying drawings, Figure 1 is a side elevation of myimproved arrangement applied as an equalized driver-brake forlocomotives. Fig. 2 is a plan view of the same; and Fig. 3 is atransverse section of the adj usting mechanism and take-up motor, takenon the line 0c c of Fig. 1.

The brake-cylinder l is mounted on the locom'ctive-frame 2 between thedriving-wheels and has a piston-rod 3 for operating the main brake-lever4, which is pivotally connected at its lower end with the push-rod 5 ofthe brakerigging. At the opposite end of the push-rod is pivoted theequalizing-lever 6, connected at one end to the brake-block 8 and at theother end to the pull-rod '7, which leads toasimilar equalizing-lever(not shown) for the brakeblock of the next driving-wheel.

The main brake-lever/l is pivoted in the,

f ulcrum-block 10 of the slack-adj usting mechanism, which comprises acasing 9, forminga guide for the movable fulcrum-block and secured tothe locomotive-frame by means of brackets 14C and 15. An adjusting-screw11 is secured to the fulcrum-block 10 and passes through a ratchet-nut21, which is operated by the take-up motor 13, having a piston 17, stem1S, a pawl 20, pivoted to the stem, and a 4 spring 19 for returning thepiston to its nor- Inal position. A cover 12, secured to the casing 9,isprovided for the ratchet-nut 21.

The pressure-pipe 16 connects the take-up motor with the brake-cylinderat a point at which it is desired to limit the travel of thebrake-piston. the brake-shoes and the slack of the brakerigging thebrakepiston traverses beyond this point, the air from the brake-cylinderpasses to the take-up motor and moves the piston 14, causing the pawl 2Oto engage the ratchet-nut 21. Then when the brakes are released thespring 19 returns the piston 111 and pawl 2O to the normal position,thus rotating the ratchet-nut 2l and adjusting the position of thefulcrum-block 10 of the main brake-lever f1. This movement compensatesfor the wear of the brake-shoes and automatically takes up the slack ofthe brakerigging.

Having now described my invention, what I claim as new, and desire tosecu re by Letters Patent, is-

1. In a locomotive brake-rigging, the co1nbination with the mainbrake-lever pivotally connected at its upper end with the pistonrod ofthe brake-cylinder, and the push-rod connected to the lower end of saidlever, of a movable fulcrum-block, to which the main lever is pivoted atan intermediate point, a guide for said fulcrum-block secured to thelocomotive-frame, a ratchet-nut and screw for adjusting the position ofthe fulcrumblock, and a take-up motor connected to the brake-cylinderfor operating the ratchet-nut.

2. In a locomotive brake-rigging, the combination of the mainbrake-lever pivoted at its upper end to the piston-rod of thebrakecylinder and at its lower end to the push-rod of thebrake-rigging,a movable fulcrum-block pivoted to said lever at anintermediate point, a guide for said fulcrum-block secured to thelocomotive-frame, and a take-up mechanism for automatically adjustingthe position of the fulcrumblock when the brakepiston passes a certainpoint of its traverse.

In testimony whereof I have hereunto set my hand.

HENRY A. WAI-ILERT. Witnesses:

JAS. B. MACDONALD, E. A. WRIGHT.

Vhen owing to the wear of 5o

